Jul 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991hst..prop.3996b&link_type=abstract
HST Proposal ID #3996
Physics
Hst Proposal Id #3996
Scientific paper
This proposal outlines the test procedure for the PRISM mode aperture h,v and V2,V3 position determination. Uncertainties in PRISM aperture locations due to deflection by the beamsplitters in the prism assemblies requires that each of the PRISM apertures be calibrated separately. The process of splitting the incoming beam from the HST to the two beamsplitter apertures causes a slight deviation in the second aperture. This deviation is unknown at present and cannot be calibrated using data from previous mission support calibration tests. Due to the light loss at the edges of the HSP apertures from spherical aberration. This misalignment causes a different photometric error through the two apertures from target acquisition errors or spacecraft jitter. To minimize this effect, both the detector locations of the apertures as well as the spacecraft locations of the apertures will be measure directly. A stellar source will be used in each of the 6 PRISM apertures to determine their h,v positions. Nineteen days later the stellar source will be scanned across the apertures in two orientations to provide V2,V3 calibration of the apertures.
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